charinputhandler.h

Linux下比较早的基于命令行的DVD播放器

//
// Copyright (c) 2003 by Istv醤 V醨adi
//
// This file is part of dxr3Player, a DVD player written specifically 
// for the DXR3 (aka Hollywood+) decoder card.

// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#ifndef DXR3PLAYER_INPUT_CHARINPUTHANDLER_H
#define DXR3PLAYER_INPUT_CHARINPUTHANDLER_H
//------------------------------------------------------------------------------

#include "input/InputListener.h"
#include "input/InputHandler.h"

#include "util/ParseTree.h"

//------------------------------------------------------------------------------

namespace input {

//------------------------------------------------------------------------------

/**
 * Character-based input handler. It receives characters from some source and
 * produces operations based on a parse tree.
 */
class CharInputHandler : public InputHandler
{
public:
    /**
     * The structure for input sequences.
     */
    struct Sequence {
        /// The character sequence
        const char* sequence;

        /// The length of the sequence. If 0, the string is 0-terminated.
        size_t length;

        /// The operation associated with the sequence
        InputListener::operation_t operation;
    };

private:
    /**
     * The listener to this input.
     */
    InputListener& listener;

    /**
     * The parse tree for the input sequences.
     */
    ParseTree<char, InputListener::operation_t> parseTree;

    /**
     * The parser for the input
     */
    ParseTree<char, InputListener::operation_t>::Parser parser;

public:
    /**
     * Construct the input handler with the given listener.
     *
     * @param sequences the set of the sequences to use. The last
     * entry should have a sequence member of 0.
     */
    CharInputHandler(InputListener& listener,
                     const Sequence* sequences);

    /**
     * Add a character. If a valid sequence is completed by this
     * character, the listenter will be called.
     */
    void add(char c);
};

//------------------------------------------------------------------------------

} /* namespace input */

//------------------------------------------------------------------------------
#endif // DXR3PLAYER_INPUT_CHARINPUTHANDLER_H

// Local variables:
// mode: c++
// End: